Pt100 Relays (Options +2L506, +3L506, +5L506, +8L506) - ABB ACS880-37 Hardware Manual

52 Operation principle and hardware description
The customer connects PTC sensors to the thermistor relay, and the terminals of the
auxiliary relay of the normally open contact, for example, to
•
main breaker control circuit of the drive for opening the breaker in case of motor
overtemperature or
•
appropriate digital input of the drive for tripping the drive and generating a fault
message in case of motor overtemperature or
•
customer control circuit.
See also
•
firmware manual for parameter settings
•
Wiring the thermistor relay(s) (options +L505 and +2L505)
•
circuit diagrams delivered with the drive for the actual wiring.

Pt100 relays (options +2L506, +3L506, +5L506, +8L506)


What the option contains
The standard Pt100 relay option includes two (+2L506), three (+3L506), five (+5L506) or
eight (+8L506) Pt100 temperature monitoring relays and an auxiliary relay wired to a
terminal block. Other numbers of Pt100 relays must be ordered as application engineered.
Description
A Pt100 relay is used for overtemperature supervision of motors equipped with Pt100
sensors. For example, three sensors measure the temperature of the motor windings and
two sensors the temperature of the bearings. The sensor resistance increases linearly as
the temperature rises. The relay releases at an adjustable wake-up level and indicates
motor overtemperature through its change-over contact.
The relay provides connection terminals for one Pt100 temperature sensor and terminals
of one normally open and one normally closed contact.
The customer connects Pt100 sensors to the Pt100 relays (one sensor per relay) and the
auxiliary relays of the normally open contacts of the Pt100 relays, for example, to
•
main breaker control circuit of the drive for opening the breaker in case of motor
overtemperature or
•
appropriate digital input of the drive for tripping the drive and generating a fault
message in case of motor overtemperature or
•
customer control circuit.
See also
•
firmware manual for parameter settings
•
Wiring the Pt100 relays (options +2L506, +3L506, +5L506 and +8L506)
•
Pt100 relay alarm and trip limit setting instructions on page
•
circuit diagrams delivered with the drive for the actual wiring.
on page 98
on page
138
99